Foliar level of phosphorus and its bioindicators in Cucumis melo grafted plants. A possible effect of rootstock

abonos de oligoelementos acid phosphatase amidon carbohidratos carbohydrate content carbohydrates contenido de carbohidratos cucumis melo cucurbita maxima feuille fosforo fructosa fructose glucide glucosa glucose grafting greffage greffon hojas injerto injerto de pua leaves melon melons micronutrient fertilizers oligoelementos phosphatase acide phosphore phosphorus plante porte greffe portainjertos porte greffe racine ratoons rejet de souche renuevo roots rootstock crops rootstocks saccharose scions starch sucre sucrosa sucrose sugar teneur en glucides trace elements